I have just started putting code on GitHub, but I have no clue about what license to pick - if any. GitHub has a help page with link to a site that is supposed to help you choose. But I find the whole license thing kinda scary. The MIT license looks like it can fit, but not sure. I guess to be sure I will need to study the licenses to get an understanding of what they include.

Anyone with experience on license choice? For now the repositories I have put up are educational, just to be able to share easily. So license might not matter much on these, but when should I start worrying about choosing the right license?

I always use MIT license. You don't need to worry too much about licenses unless something you start REALLY starts taking off, like jQuery or Apache. Beyond that, it's not like the technology police will come after you if you pick the wrong one.